How much would it be...?

i , a 13 year old girl, loves the backstreet boys. As some of you know for the past year they have a cruise to the bahamas.You get to hang out with them. so I was wondering how much a train ticket from New Jersey to Miami would be? Or a plain ticket from newark airport to orlando airport or an airport closer to miami? I need to know how much money it would be in total to convince my mom to go. PLEASE HELP!!! p.s 2 weeks before I'm going to disney so please find the cheapest prices! THANKS!